Make a type of game/adventure horrar type.
Have a choice feature into it. Have people go up to a double path and make a sound come the left or right speaker. If there is a sound on the right speaker then the person should go left, or vise-versa. Simple as that, but try to add more creativity to it.
To make the sound go to left or right speaker have a unit attacking another unit far off in the distance either on the left or right side of the paths. Make sure its a unit that has loud attacks like Lurkers, Tanks, Nukes, etc.
I hope you understand what I'm trying to say.
Good Luck 
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